RE: Sample Custom Decorator

[Sells, Fred]

I'm no expert but this is what I built to log all user actions -- warts
and all

def decorate(func):
    ##################print 'Decorating %s...' % func.__name__
    def wrapped( *args, **kwargs):
        request = args[0]
        if len(args)>1: command=str(args[1])
        else: command = ''
        ipaddr = request.META['REMOTE_ADDR']
        user = request.session.get('user', None)
        if user: userid = user.userid
        else: userid = '?'
        qs =  extract_querystring_from_request(request)
        parameters = Parameters(**qs)
        resid = parameters.pop('resid', '')
        assessmentid = parameters.pop('id', 0)
        facility = parameters.pop('facility','')
        modified = func.__name__ in ("setvalues", "setraw", "create",
'editcaas')
###        print func.__name__, 'zzzzzzzzzzzzzzzzzzzzz', modified, qs
        modified = modified or (func.__name__=='command' and
command!='print')
        fieldnames = parameters.values().keys()
        for signature in SIGNATURE_FIELDS: 
            if signature in fieldnames: command='signit'
        if (not facility) and resid:
            facility = resid[:2]
        option = str(parameters)[:110]
        action = '%s:%s' % (func.__name__, command)
###        print  "\n\n\n\ncalled wrapped function with ", (action,
option, str(parameters))
        record = models.HipaaLog.objects.create(Version=K.VERSION,
userid=userid, 
                                                Action=action,
Options=option, 
                                                #StartTime =
datetime.datetime.now(),
 
AssessmentId=assessmentid, ResidentId=resid,
                                                Modified = modified,
                                                IpAddress = ipaddr,
Facility=facility)
        #print record.Modified, record.Action, 'record'
        results = func( *args, **kwargs)
        #record.StopTime = datetime.datetime.now()
        #record.save()
        return results
    ############################print 'done'
    return wrapped

--------------------------------
@decorate 
def command(request, *args, **kwargs):
        ...

-----Original Message-----
From: django-users@googlegroups.com
[mailto:django-users@googlegroups.com] On Behalf Of Kurtis
Sent: Tuesday, October 11, 2011 12:03 PM
To: Django users
Subject: Sample Custom Decorator

Hey Guys,

Would anyone be willing to show me an example of a very simple and
dumb decorator for views? I've been trying to read the existing
decorators and play with a couple of snippets but I'm having a lot of
trouble with two aspects -- grabbing the User Instance and Redirecting
somewhere besides Login (without making it look like a hack).

Here's some ugly pseudo-code for what I'm trying to accomplish...

# Custom Decorator
def my_decorator(function = None)

    # Grab Data
    request = how_do_i_get_this?
    user = request.user

    # Perform Logic, Redirect or Continue Normally
    if user.foo():
        redirect to '/foo' URL
    else
        display requested view?


# Decorated TemplateView
url(r'^$', my_decorator(TemplateView.as_view(template_name =
'bar.html'))),

Thanks!

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